Disney XD has set a premiere date for the upcoming Lost-themed episode, which features a story from Damon Lindelof and guest-star Terry O’Quinn, who played John Locke on the ABC drama.

When a mysterious locked capsule falls into Phineas and Ferb’s backyard, the duo accidentally unleash something they cannot control. Elsewhere, Perry learns that Dr. Doofenshmirtz has been abducted and tracks him to Seattle where Professor Mystery is planning something sinister.

The episode, aptly titled “Lost in Danville,” will air Sept. 29 at 7:30 p.m. ET. on Disney XD.